Phil,

The 277 Vac is taken from 3 phase transformers and used to power
fluorescent lights in extremely large facilities such as airports, high
rise buildings, sports arenas, etc. Most extremely large facilities have a
277 volt bus that powers the entire facilities lighting. The 277 volt
scheme presents a tremendous cost savings as individual lamp ballasts are
not required. Other benefits include centralized power factor control and
other power saving controls. LSI Lighting / Prescolite of San Leandro,
California, USA is the world leader in 277 V bus power control technology.

Sincerely,
Ned Seith
Nedtronics
59 3rd Street
Gilroy, CA 95020
(408) 842-0858
G O T    G A R L I C ?
GILROY GARLIC FESTIVAL 2001 STARTS TODAY!
 >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
At 10:59 AM 7/27/01 -0500, you wrote:
>sounds like the phase voltage of a three-phase 480V Y-connected supply....
>
>
> > -----Original Message-----
> > From: Douglas Butler [mailto:dbutler@IMETRIX.COM]
> > Sent: Friday, July 27, 2001 11:50 AM
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: Re: [EE]: Transformerless PSU
> >
> >
> > > malfunctioning solid state controllers that provided 120
> > Vac to "Exit
> > > Lamps" from a 277 Vac main in all the international airports
> > > throughout the
> > > free world! Prior to this project, I didn't know that the typical
> > > international airport has 2,000 "Exit Lamps".
> >
> > What an odd voltage!  I design stuff for seaports all over
> > the world but
> > I have never run into 277Vac.  Is this some derivative of airplane
> > wiring?
> >
> > Sherpa Doug
> >
> > --
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> >
>
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